Office depot has a sale on school supplies. a spiral notebook costs on $2 and a 3-ring binder costs $5. you need to buy 6 items in order to get the sale prices. you choose a combination of notebooks and binders for a total of $20. in your response, be sure to include: a system of equations to solve the prompt. # spiral notebooks # 3-ring binders if you can solve the problem without writing a system, be sure to communicate your work/thought process so that you can get partial credit.

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?